Question

Raster tiles lose spatial reference

  • 11 February 2015
  • 9 replies
  • 4 views
D
Hi All,

 

 

I am currently trying to load in some raster tiles that I have downloaded from the European Space Agency in FME. I have already successfully displayed them in ArcMap and are in a D_WGS_1984 projection. FME does not seem to recognize the spatial reference as it cannot display them in the visualizer and when any transformers are used, they seem to turn them upside down and out them at the origin of any projection that they are set to.

 

 

Has anyone else found this problem before who could maybe help out or is this just a problem that is unique to the dataset I am using?

 

 

Many Thanks

9 replies

david_r
Rank
Userlevel 4
Hi,

 

 

Are you sure you use the correct reader? Also be careful about specifying the coordinate system on the reader unless you're 100% sure that you specify the right thing, as it will override whatever coordinate system info is contained in the raster.

 

 

David
M
Badge
David has very valid points and I would definitely QC that first. I would then carefully (as he pointed out) specify the coordinate system on the Reader as LL84. That is FME's default WGS84 coordinate system and your raster, for whatever reason, my not be read in correctly in that regard. 

 

 

See here for more details on how FME handles LL84: http://fmepedia.safe.com/articles/FAQ/Spherical-or-Web-Mercator-Coordinate-System

 

 
D
Hi Guys,

 

 

I've tried specifying the projection on the reader as you said but no success unfortunately. Any other suggestions?

 

 

Doug
david_r
Rank
Userlevel 4
Hi,

 

 

did you also try to leave the coordinate system blank (not set)? That will force FME to try and imply the coordinate system from the dataset.

 

 

David
D
Hi David,

 

 

Yes, thats what I tried first of all and that hasn't worked either. I've also tried reprojecting with no luck.

 

 

Thanks,

 

Doug
M
Badge
Can you provide a link to a sample of the data?
D
https://scihub.esa.int/dhus/

 

All data is downloaded from here.
F
https://scihub.esa.int/dhus/

 

All data is downloaded from here.

Did you figure this out? I'm having a similar issue.

xiaomengatsafe
Rank
Badge +2

Did you figure this out? I'm having a similar issue.

Hi @fme_noob, Thanks for your question. I think to help debug your specific problem, our experts in the community will likely need to know a bit more about the details. Since this thread is quite old, I'd recommend that you post a new question, and include a more detailed description of your issue, and maybe include a sample of your data and the workspace you used.

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